azurevaping.com (formerly Bluemistvaping) has large bottles for super low prices. some flavors are hit or miss. their mix is either 100vg or 80pg tho. I'd suggest Smooth if you like minty/chocolate or caramel tobacco for a strong caramel flavor. they offer extra flavor, also.
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If you want to experiment and have low cost, look into DIY liquids. Very cheap and you can get whatever nic, pg/vg ratio and flavor strength you want.
EC blends is another option and they offer 5ml sample sizes for only $2.50.
MBV is fast and have some great juice too.
You can't go wrong with either vendor.
For bargain pricing, another vote for MBV. I also like D&D Vapor and Heather's Heavenly Vapes, although they're a little more money than MBV.
I have six or seven bottles of Azure Vaping's products on the shelf, but I've only gotten around to trying one of them, (Vanilla Cream) and I was kinda "meh" about the whole experience. It was okay, but not spectacular. But then again, I wasn't expecting Ritz Carlton for Motel Six money, so it evens out.